Identical to the PMV 2000 except for its colorOne-way, closed position, "no leak" design creates positive airway pressure, and restores closed respiratory system for improved swallow and reduced aspirationLightweight, smaller and opens with even less resistance than the original PMVMore commonly used by nonventilator poeople, but also can be used in line with mechanical ventilators in conjunction with nondisposable, flexible rubber tubingComes with one PMV Secure-It(tm)15 mm I.D./23 mm O.D.